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src/stores/useCounter.js

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+import { ref, computed } from 'vue'
+import { defineStore } from 'pinia'
+
+export const useCounterStore = defineStore('counter', () => {
+  const count = ref(0)
+  const doubleCount = computed(() => count.value * 2)
+
+  function increment() {
+    count.value++
+  }
+
+  function decrement() {
+    count.value--
+  }
+
+  return { count, doubleCount, increment, decrement }
+})